In‐Situ‐Generated MoO ₂ on MoS ₂ /ZnO Heterostructures with Enriched S,O‐Vacancies for Enhanced Electrocatalytic Reduction of N ₂ to NH ₃

Abstract Electrocatalytic nitrogen reduction reaction (NRR) is a green method for synthesis ammonia under mild condition compared to energy‐intensive Haber‐Bosch process. Herein, a novel heterojunction material (MMZ‐900) is prepared as an excellent electrocatalyst for NRR at 900 °C, which is composed of MoS 2 , MoO 2 and ZnO with nonuniform charge distribution of rich S and O vacancies. As a result, MMZ‐900 exhibits about 8 times higher Faradaic efficiency and 5 times higher NH 3 yields for NRR than pure MoS 2 , respectively. These new insights may open up opportunities for exploiting efficient NRR electrocatalysts by simultaneously improving sulfur and oxygen vacancies on heterojunction material.